20202111221 has 4 divisors (see below), whose sum is σ = 20292703872. Its totient is φ = 20111518572.

The previous prime is 20202111199. The next prime is 20202111239. The reversal of 20202111221 is 12211120202.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12211120202 = 2 ⋅6105560101.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20202111221 is a prime.

It is a super-2 number, since 2×20202111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20202111196 and 20202111205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20202111271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45295991 + ... + 45296436.

It is an arithmetic number, because the mean of its divisors is an integer number (5073175968).

Almost surely, 2^20202111221 is an apocalyptic number.

It is an amenable number.

20202111221 is a deficient number, since it is larger than the sum of its proper divisors (90592651).

20202111221 is an equidigital number, since it uses as much as digits as its factorization.

20202111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90592650.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20202111221 its reverse (12211120202), we get a palindrome (32413231423).

The spelling of 20202111221 in words is "twenty billion, two hundred two million, one hundred eleven thousand, two hundred twenty-one".